Amaranth

Amaranth is actually a seed, not a grain, but it acts like a grain, similar to quinoa. Amaranth seed and amaranth seed flour are the most common ways to consume amaranth, though the leaves of the amaranth plant are common in Asian and Caribbean cuisines. Amaranth is surprisingly high in protein, and is also a complete protein because it contains all the essential amino acids, unlike many other grains that don't contain lysine.